Guiote, V., F. Cunha, A. Pinho, A. Brinca, and R. Vieira. “Advanced Merkel Cell Carcinoma: A New Case of Spontaneous Regression”. Journal of the Portuguese Society of Dermatology and Venereology, Vol. 75, no. 3, Jan. 2018, pp. 301-4, doi:10.29021/spdv.75.3.822.